GrubHub, which is battling startups ranging from DoorDash and Uber Eats to Amazon.com Inc's Amazon Restaurants, has swept up more than a half-dozen companies since its April 2014 initial public offering and has been spending aggressively to expand its delivery network.

Sales and marketing outlays were $78.5 million in the first quarter, almost 61 percent more than a year earlier.

Revenue jumped 39 percent to $323.8 million during the quarter, when total costs and expenses climbed 57 percent to $314.9 million.

First-quarter net income fell to $6.9 million, or 7 cents per share, from $30.8 million, or 34 cents per share, a year earlier.

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